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Rarpd services Reverse ARP requests on the Ethernet connected to interface. Upon receiving a request, rarpd maps the target hardware address to an IP address via its name, which must be present in both the ethers(5) and hosts(5) databases. If a host does not exist in both databases, the translation cannot proceed and a reply will not be sent. By default, a request is honored only if the server (i.e., the host that rarpd is running on) can "boot" the target; that is, a file or directory matching the glob /tftpboot/ipaddr* exists, where ipaddr is the target IP address in hex. For example, the IP address 204.216.27.18 will be replied to if any of /tftpboot/CCD81B12, /tftpboot/CCD81B12.SUN3, or /tftpboot/CCD81B12-boot exist. This requirement can be overridden with the -s flag (see below). In normal operation, rarpd forks a copy of itself and runs in the background. Anomalies and errors are reported via syslog(3).
-a Listen on all the Ethernets attached to the system. If `-a' is omitted, an interface must be specified.
-f Run in the foreground.
-s Supply a response to any RARP request for which an ethernet to IP address mapping exists; do not depend on the existence of /tftpboot/ipaddr*.
-v Enable verbose sysloging.
/tftpboot
RFC 903: Finlayson, R.; Mann, T.; Mogul, J.C.; Theimer, M. Reverse Address Resolution Protocol. 1984 June; 4 p.